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Britain's Prime Minister David Cameron, rear facing camera, visits a looted Liddell supermarket in Salford, England, Friday, Aug. 12, 2011. Speaking of the riots that broke out in several British cities, Cameron said police officers had been overwhelmed at first and outmaneuvered by mobile gangs of rioters. He said "far too few police were deployed onto the streets. And the tactics they were using weren't working."(AP Photo/Jon Super, pool)

Britain's Prime Minister David Cameron, rear facing camera, visits a looted Liddell supermarket in Salford, England, Friday, Aug. 12, 2011. Speaking of the riots that broke out in several British cities, Cameron said police officers had been overwhelmed at first and outmaneuvered by mobile gangs of rioters. He said "far too few police were deployed onto the streets. And the tactics they were using weren't working."(AP Photo/Jon Super, pool)